Something drawing on my battery

I have a Priority Start on my 04 Roadtrek. Keep in mind the Priority Start will continue to draw battery power after disconnecting the chassis power from the battery. After a few days of this draw, the battery will be dead. Manufacture recommends you start the vehicle every 60 to 90 days. My RT will draw a battery down in about a week (seems to be a common problem on this model). My solution is the Priority Start on the positive terminal for times something may be left one and a disconnect on the negative terminal for longer storage times.